A quadriceps strain often occurs in people in their middle-age. They may happen from running or jumping activities. And they can become quite painful. If the strain is severe, it may also involve swelling, weakness, and trouble moving the leg.
For more mild forms – such as a grade I strain – the muscle pain in your quads may feel mild, you don’t have trouble moving the leg, but you may experience slight weakness. For a grade II strain, the pain becomes more moderate or severe. There is likely noticeable weakness and obvious trouble moving the leg. In grade III strains, the pain is severe. You have trouble bearing weight on your leg, difficulty moving it, and obvious weakness or loss of strength.
However, strains aren’t the end all, be all to your muscle pain in the quads. A blood clot may create issues – although rare. A direct blow to the leg may cause damage and contusions – leading to what feels like muscle pain.